So long as the tank is building momentum and pulling the next pack when the previous one is about to die I have no complaints, but if you are the kind of tank who will pull one pack and then have time to put your weapon away and turn on the spot before moving towards the next pack and pulling you will make me complain because you are wasting time after every pull instead of calculating when things will die either stunning the last target so you can ignore it because you know it will die before the stun wears off and can set up the next pull or just pulling because it will only be one or two more GCDs till the previous trash dies just leaving the new set.

And if you aren't going to try and take the risk someone else forced on the group what is wrong with you!? So a DPS pulled more mobs, so what? Pick them up see how much extra damage comes in, you are getting a freebie you are getting to see how much you can take without getting the blame for having pulled too much, letting the DPS die is the stupidest thing you can do in that situation because you are then even more likely to die from the DPS loss.